Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December corresponds with a reduction in the average high-temperature, down from November's fresh 50.4°F (10.2°C) to an icy 39.4°F (4.1°C). In December, the nighttime temperature lowers to an average of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity is 78%.Rainfall
February and December are months with the least rain when the rain falls for 8 days and typically aggregates up to 1.65" (42mm) of rain.Snowfall
January through April, November and December are months with snowfall. In Stonington, Illinois, during December, snow falls for 5.5 days and regularly aggregates up to 1.61" (41mm) of snow. Throughout the year, there are 26.3 snowfall days, and 8.94" (227mm) of snow is accumulated.Daylight
December has the shortest days of the year in Stonington, with an average of 9h and 24min of daylight.On the first day of December in Stonington, sunrise is at 6:59 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:42 pm CST.
Sunshine
The average sunshine in December is 4.6h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in Stonington during December?
What is the average humidity in December in Stonington?
What is the driest month in Stonington?
How many days does it rain in December in Stonington?
How many days does it snow in December in Stonington?
What is the month with the shortest days in Stonington?
How many hours of daylight does Stonington have in December?
What time are sunrise and sunset in December in Stonington?
How many hours of sunshine does Stonington have in December?
When is the lowest UV index in Stonington?
How high is the UV index in December in Stonington?
Average temperature in December
Stonington, IL
- Average high temperature in December: 39.4°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Stonington, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Stonington, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Stonington, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Stonington, IL
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is April (3.58").
The driest months (with the least rainfall) are February and December (1.65").
Average rainfall days in December
Stonington, IL
- Average rainfall days in December: 8 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (7.1 days).
Average snowfall in December
Stonington, IL
- Average snowfall in December: 1.61"
The month with the highest snowfall is January (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Stonington, IL
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Stonington, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Stonington, IL
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is June (11 days).
Average UV index in December
Stonington, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Stonington, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are June, August and September (Cloud cover 30).
Average visibility in December
Stonington, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Stonington, Illinois, USA
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